Locomotive-boiler



(No Model.) 2 Sheets-Sheet 1.

J. T. OONNELLY. LOGOMOTIVE BOILER.

No. 488,919. Patnted .Dec. 27, 1892.

(No Model.) 2 Sheets-Sheet 2.

J. T. GONNELLY. LOGOMOTIVB BOILER.

N0.v488,919. Patented Dec. 27, 1892.

UNITED STATES PATENT OFFICE.

JAMES THOMAS GONNELLY, OF MILTON, PENNSYLVANIA.

LOCOMOTlVE-BOILER.

SPECIFICATION forming part of Letters Patent No. 488,919, dated December2'7, 1892.

Application filed May 10, 1892. Serial No. 432,479. (No model.)

To all whom it may concern.-

Be it known that I, JAMES THOMAS CON- NELLY,a citizen of the UnitedStates, residing at Milton, in the county of Northumberland and State ofPennsylvania, have invented certain new and usefulImprovements inLocomotive-Boilers; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to locomotive boilers, and it has for its objectto provide a construction of boiler of this class in which the maximumquantity of steam is generated and maintained with a given quantity offuel.

A further object of the invention is to produce a boiler of suchconstruction as will obviate the collection of mud or other deposits ontop of the fire-box, in which a greater area of heating surface issecured, and of materially increased strength and durability.

To this end, my invention consists, substantially, in the construction,combination and arrangement of parts as will be hereinafter more fullydescribed and particularly pointed out in the claims.

In the drawings Figure l is a vertical 1ongitudinal sectional view of aboiler embodying my invention. Fig. 2 is a transverse sectional view,taken on the line 00-02, Fig. 1. Fig. 3 is a similar view on the liney-y, Fig. -1.

Corresponding parts in the figures are denoted by the same letters ofreference.

Referring to the drawings, A designates the boiler, comprising the frontchamber B, barrel C and fire-box chamber D, said parts being in the mainof any well known or approved construction.

E designates the fire-box, which is by preference formed of asingle-sheet, and is in cross-section segmentally-curved at its top andsides. From the lower edge of the latter, the sheet is extendeddownwardly and parallel, as shown, forming a grate space, 6, andwater-legs, a a, between said extensions of the sheet and the outershell A. The firebox shell is removed at all points from the outer shellA and is secured thereto in any suitable and mechanical manner bystay-bolts and radial stays.

and danger.

At its forward end, the fire-box is provided with an extension, F,projecting within the barrel 0 preferably for more than one-half thespace usually occupied by the boiler fines. This extension is also bypreference formed of a single sheet secured at its rear edge to thefront edge of the fire-box shell. In crosssection, the extension iscircular from its rear end to about its longitudinal center, and fromthe latter point its contour is changed to its extreme front end, whichis approximately oval. The bottom of this extension is inclined from itsfront end downwardly to its rear end, thus preventing the accumulationof coal or dust therein. It will be further noted that by the provisionof this extension,

and its novel shape the heating surface isgreatly increased. The forwardend of the extension F is provided with a head, f, and the chamber B andbarrel 0 are divided by the usual partition 1).

Within the barrel 0, and mounted between the head f and partition I),are the boiler fiues G. The latter are secured to said head andpartition in any well known or approved manner, but are essentiallyshorter, and consequently more rigid, than is customary.

The operation and advantages of myinvention will be readily understoodby those skilled in the art to which it appertains. It is well-knownthat in the usual construction of locomotive boilers, the extreme lengthof the flues cause them to sag after a brief period of time, and lyingone upon the other the slight space between them after short servicebecomes filled with mud or other deposit, impairing the offices of theboilers and causing what is known as mud burning. This condition of thelines, and form of construction where the fines are in direct contactwith the fire, causes as a consequence burning of the ends of the fiuesand the resultant expense Another disadvantage of the long fines is thematerial difficulty in cleaning the same. It may also be'noted that usually in boilers of this class, by reason of the general construction,the inner sheets are formed with fiat top surface, upon which mud orother deposit collects, affecting the efficiency of the boiler.

To obviate these and other objections, is

the purpose of my present invention. In the latter construction, byreason of the provision of the fire-box extension, the fines are removedfrom the fire, and the danger of burning of the ends of the sameobviated. This extension also provides an additional heating surface,and by its employment the fines are shortened and rendered more rigid,thus obviating the liability to sag and the consequent evil resultsabove noted. It will also be apparent that by constructing the parts ofthe boiler subject to the greatest pressure approximately cylindrical,and having no weak flange or sharp corners, greater strength is insured,While being without flat surfaces, except the legs, back head andthroats, the accumulation of mud or other deposits is obviated,

I claim as my invention- 1. As an improvement in locomotive boilers, afire-box approximately circular in crosssection, and an extension at theforward end of the same and projecting within the barrel of the boiler,said extension being circular in cross-section at its rear end, andapproximately oval at its forward end, and having its bottominclinedfrom its forward to its rear ends; substantially as set forth.

2. A fire -box approximately circular in cross-section, and a forwardextension projecting within the barrel of the boiler; said extensionbeing circular in cross-section at its rear end, oval at its forwardend, and having its bottom inclined from .its forward to its rear ends,in combination with contracted boiler fines secured in the head of theexten sion, as specified.

In testimony whereoflaffix my signaturein presence of two witnesses.

JAMES THOMAS (JONNELLY.

Witnesses:

WILLIS H. LAWRENCE, H. E. AUGSTADT.

